期刊
CARBON
卷 91, 期 -, 页码 416-422出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2015.05.012
关键词
-
资金
- Ministry of Science and Technology of Taiwan [NSC 102-2221-E-390-007-MY3]
The p-n-p double transformation and ultrasensitive-insensitive gas sensing of reduced-graphene-oxide-flake stacked films (rGOFSFs) were controlled by changing the annealing temperature from 100 to 400 degrees C on a sodium silicate substrate, as a result of the competition between the thermal reduction, decomposition, and diffusion of Na, as determined from comprehensive microstructure characterization. The slightly reduced p-type GOFSF showed ultrasensitive gas sensing at room temperature (RT), with a response of 58% to 1 ppm ethanol and a high detection limit (sub-ppm). Interestingly, the rGOFSF can become n-type and insensitive to gas sensing, with a low response of -0.5% to 50 ppm ethanol, by simply increasing the annealing temperature to 200-300 degrees C. The capability of controlling carrier types and ultrasensitivity-insensitivity transition to gas is useful for developing nanodiodes and RT gas sensors. (C) 2015 Elsevier Ltd. All rights reserved.
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